Can someone recommend a brand of fixed harness lines that don't swing around on a skinny boom (25mm diameter). The Chinook fixed 30 inch lines I've been using are good on a larger diameter boom, but they always seem to swing and I find myself inadvertently re-hooked in half way down a wave.

The boom is the same diameter as a Severne Enigma. Can someone using Severne lines on an Enigma confirm that they don't swing?

In the windsurfing dreamtime we used to attach some shock/bungee cord to the top of our harness lines. It made them less likely to slip out when rattling across chop and pulled the harness line up and inch or so when unhooked and gybe/bottom turning.

I have found that the Ezzy harness lines (clear tube seeing through) have less amount of swing, in particular compared to the Da Kine. I am currently using 30" Ezzy on a Goya skinny boom.I have found hardest part of modern windsurfing is harness line length and boom height settings. It seemed so much easier in the 1980s with chest harnesses and you just purchased harness lines of one size fits all and they worked.

Thanks for the responses.